156 NEW-YORK FAUNA— MOLLUSCA. 
GENUS CEMORIA. Leach. 
Shell small, cup-shaped. Apex elevated and curved forward, with a fissure just behind the 
apex, 
CEMORIA NOACHINA. 
PLATE IX. FIG. 195. 
Patella noachina. Lin. 
Cemoria flemingti. Lracu, Br. Shells, pl. 10, fig. 5. 
Rimula noachina. Couruovy, Bost. Journ. Nat. Hist. Vol. 2; p. 87. 
C. id. Gov tp, Invertebrata of Mass. p. 156, fig. 18. 
Discription. Shell small, conical. Apex recurved, obliquely perforated ; opening within 
by a smaller aperture, which is covered by an arched scale. Surface covered with about 
twenty unequal radiating ribs, which feebly crenate the margin of the aperture. Color, 
bluish white. 
Length, 0°2. Height, 0°1. 
This remarkable little shell, which also occurs on the shores of Europe, has been only 
obtained from the stomachs of fishes on our coast. 
(EXTRA-LIMITAL.) 
C. alternata? (Fissureuia id. Say, Ac. Sc. Vol. 2, p. 224.) Shell with equally concentric lines 
crossed by alternately larger and smaller radii, all of which are not dilated: perforation oblique 
oblong; apex with an indented transverse line at the larger end of the perforation. Color, cinereous 
or dusky ; within white. Length, 0-8 -—1+5; diameter, 0°6-—1-0. Coast of the U.S. 
